Well, that's the thing. That's not a problem with Christianity per se, but of just being human in general. People of a certain upbringing and/or world view often think that things would just be better if other people adopted their point of view. Religion, politics, on and on. That's why a good education and an emphasis on living a life of empathy are two very important things every person should strive for. The problem with a lot religions that revolve around prophets when it comes to this issue, is that more often than not there are texts that people are able to point to in order to reinforce both their arguments and their beliefs. It can be something that can be very hard to address without being bogged down both by emotional investment as well as semantics. I mean, speaking of Christianity in particular, the whole concept of The Kingdom of God and what it actually entails has been contested up, down, left, and right.